This is the 8128th most frequent Russian word.
ленинградкой
The word "ленинградкой" is the instrumental singular form of "ленинградка," which refers to a female resident of Leningrad (historical name of St. Petersburg, Russia).
This is used to refer to a female person originating from the city of Leningrad (now Saint Petersburg).
Вчера я встретился с ленинградкой.
Yesterday, I met a woman from Leningrad.
Here, 'ленинградкой' describes the female artist, emphasizing her origin.
Эта картина была написана ленинградкой в начале двадцатого века.
This painting was created by a female artist from Leningrad in the early 20th century.
In this case, the word specifies association with a person from Leningrad during a conversation.